intel/nir: Call validate_ssa_dominance at both ends of the NIR compile

This invokes it before we go into the optimization/lowering pass and
then right before we go out of SSA.

Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5288>

src/intel/compiler/brw_nir.c

@@ -685,6 +685,8 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir,
 
    const bool is_scalar = compiler->scalar_stage[nir->info.stage];
 
+   nir_validate_ssa_dominance(nir, "before brw_preprocess_nir");
+
    if (is_scalar) {
       OPT(nir_lower_alu_to_scalar, NULL, NULL);
    }
@@ -1053,6 +1055,8 @@ brw_postprocess_nir(nir_shader *nir, const struct brw_compiler *compiler,
       nir_print_shader(nir, stderr);
    }
 
+   nir_validate_ssa_dominance(nir, "before nir_convert_from_ssa");
+
    OPT(nir_convert_from_ssa, true);
 
    if (!is_scalar) {

src/intel/vulkan/anv_pipeline.c

@@ -242,6 +242,7 @@ anv_shader_compile_to_nir(struct anv_device *device,
                    stage, entrypoint_name, &spirv_options, nir_options);
    assert(nir->info.stage == stage);
    nir_validate_shader(nir, "after spirv_to_nir");
+   nir_validate_ssa_dominance(nir, "after spirv_to_nir");
    ralloc_steal(mem_ctx, nir);
 
    free(spec_entries);